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XRP6272ITC5TR-F Datasheet(PDF) 8 Page - Exar Corporation

Part # XRP6272ITC5TR-F
Description  2A 5V-Adjustable Low Dropout Voltage Regulator
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Manufacturer  EXAR [Exar Corporation]
Direct Link  http://www.exar.com
Logo EXAR - Exar Corporation

XRP6272ITC5TR-F Datasheet(HTML) 8 Page - Exar Corporation

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© 2011 Exar Corporation
8/13
Rev. 1.2.0
Fig. 22: PSRR Curve
APPLICATION INFORMATION
The
XRP6272
is
a
low-dropout
voltage
regulator with low quiescent current, low noise
and high PSRR. It can support load current up
to 2A. It incorporates current-limit and
thermal protection features.
TYPICAL APPLICATION SCHEMATIC
PROGRAMMING THE OUTPUT VOLTAGE
XRP6272’s internal feedback resistors set the
output voltage VOUT to 5V when the ADJ pin is
connected to GND. Alternatively; the output
voltage is adjustable via the external feedback
resistor network R1 and R2 by calculating the
following formula:
  
R1
R2
 
where, VREF is the reference voltage set
internally at 0.7V nominal.
INPUT & OUTPUT CAPACITORS
XRP6272 is optimized for use with ceramic
capacitors. To ensure stability of the device,
an output ceramic capacitor of at least 4.7µF
or 10µF (for VOUT ≤ 1.8V) is recommended. An
input capacitor of 4.7µF is recommended.
X5R
or
X7R
ceramic
capacitors
are
recommended
as
they
have
the
best
temperature and voltage characteristics.
NOISE BYPASS CAPACITOR
A 22nF bypass capacitor at BP pin can reduce
output voltage noise. This pin can be left
floating if it is unnecessary.
THEORY OF OPERATION
SHUTDOWN
By connecting EN pin to GND, the XRP6272
can be shutdown to reduce the supply current
to 0.01μA (typ.). In this mode, the output
voltage of XRP6272 is equal to 0V.
CURRENT LIMIT
The XRP6272 includes current limit protection
feature, which monitors and controls the
maximum output current. If the output is
overloaded or shorted to ground, this can
protect the device from being damaged.
THERMAL PROTECTION
The XRP6272 includes a thermal protection
feature that protects the IC by turning off the
pass transistor when the maximum junction
temperature TJ exceeds 150ºC.


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